Red bull fruit, also known as flower cow apple, is a specialty of Tianshui City, Gansu Province. It refers to the excellent varieties of Marshal apples produced in most areas of this city, which are the symbolic products of chinese national geography. The product is fine, dense, crisp and juicy, with unique flavor, rich aroma, good taste and high quality. It is recognized by many Chinese and foreign experts and marketers as the world's three famous apple brands, along with American snake fruit and Japanese Fuji. It is the first apple variety in China to obtain an official trademark in the international market.